Product label fastener



FIG. 1 is a top view of an embodiment of my product label fastener;

FIG. 2 is a front view of the fastener of FIG. 1, the back being identical;

FIG. 3 is a right side view of the fastener of FIG. 1, the left side being identical; and,

FIG. 4 is a bottom view of the fastener of FIG. 1.

The broken line showing a tag pin is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a product label fastener, as shown and described. 